Something that people say too much.. It's used for spur of the moment things. If you are socially awkward, you tend to say random things like potato, taco, or Pablo, and of course 'Bubba Squish', things that are not related to the conversation.

People sometimes say Bubba Squish to mock other people, such as "He's such a Bubba Squish."

Never call a girl a Bubba squish.

In general, Bubba Squish is used to fill in awkward conversations, or you just don't know what to say..